Ram Bahadur Khadka

Scientist (Plant Pathology), RARS, Khajura, Banke, Nepal

Nepal Agricultural Research Council.
 

Abstract

Experiment was conducted for evaluation of okra landraces against Yellow Vein Mosaic Virus (YVMV) and its management at Regional Agricultural Research Station (RARS),Khajura, Banke during rainy season of 2014. A total of 31 okra genotypes were collected from National Gene bank, Khumaltar for screening against the disease. Similarly four different  method of disease management viz. regular spray of cypermethrin, Virkon-H, net protected cultivation, milk spray were compared with control check. Disease were scored in O-6 scale at seven days interval beyond 30 days after sowing, final disease severity (FRS), area under the disease progress curve (AUDPC) were calculated to assess the disease. The okra lines showed diversity in their responses ranging from immune to highly susceptibility. The result revealed that genotype Arkaanamica was only found to be immune with the disease.Among the disease management methods the lowest disease scoring was recorded in net protect cultivation followed by cypermethrinand Virkon H sprayed treatments. Significantly the highest yield was recorded in Virkon-H sprayed plot and it was statistically at par with Cypermethrin and net protected cultivation. The results in this initial study reveal that the use of integrated approach like use of resistant variety, protected cultivation under net and /or regular spraying of vector avoiding factors could be successful to manage the yellow vein mosaic virus disease in Okra.

Keywords: Okra, varietal screening, YVMV, Area under Disease Progressive Curve, protected cultivation